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How to solve the equation of 10x + 20 (x-3.5) = 80?
10x+20（x-3.5）=80
10x+20x-70=80
30x=80+70
30x=150
x=5
How to solve the equation of 10x-5 (10-x) = 70
10x-5（10-x)=70
10x-50+5x=70
10x+5x=70+50
15x=120
x=120/15
x=8
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